Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa64a10dcb1b65ec…

MALICIOUS

PDF

98.5 KB Created: 2021-06-20 15:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d93a43abacba48a52be7992998a2d190 SHA-1: b8e8e69bab2b08449425a5cf9ce223c6e08d27e3 SHA-256: aa64a10dcb1b65ec161a8bcb312ba26e94ad25aeedf283a2debbe08fa7d682a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=application+of+floyd+warshall+algorithm PDF link annotation
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e960523f29---jefus.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2ed6ce362df59fae1aa86f1d95e72739/54726705878.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p78q4eqaqgv3e9fqnrfhk87505/wenowizovomo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab05242e2a2---tatotomosaju.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ca0143f1b---datadozapi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/54db2d0426d50b48f1fcc57e3e960d9b/wiziberugirafeda.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160859ff7232f7---mituj.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94855b26eb---raloxadogixozepuni.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/53900019539.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05b83f1e41---midudodize.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b79fd29d20a---digin.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/pakej.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfb86aa34f---devunaxubugasikufiluj.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/22444152a52a9c00b9dc68d79173de84/80406282533.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1bb004032acb1f91af25c402688c7851/putawegovaru.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2fc925400---dilisakagaponadaxoxavije.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/tusarajebowoveguva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 5752 bytes
SHA-256: 6bc3943064b9974b20bbaa0821326ba92bc03ebc4374629c0a77aca171f8312e
font_01_sfnt_off00013aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEA 13280 bytes
SHA-256: fa216a44d5bdde2c5c72211fa1b31bddc62a1160ed4df3339dea4365d53e9b68
font_02_sfnt_off000167a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A3 16064 bytes
SHA-256: 8407df14a2738efe3d2aaec449fc7b67f888222f7621c5c094f7d2f3a91843ca

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